#include<iostream>
using namespace std;
typedef long long LL;
int n;
LL gcd(LL a, LL b)
{
	return b ? gcd(b, a % b) : a;
}
int main()
{
	int t;
	cin >> t;
	while (t--) {
		LL a, b;
		cin >> a >> b;
		cout << gcd(a, b) << endl;
	}
	return 0;
}